Biennial & Perennial Weeds
KNAPWEED: BROWN and SPOTTED Centaurea stoebeand L. and Centaurea jacea Life Cycle: Biennial/Perennial Plant Description: 22 different knapweed (Centaurea spp) species are well established in the United States. Spotted (biennial) and brown (perennial) knapweed overlap in distribution and share similar characteristics. Spotted spreads by seed, but brown knapweed can also spread from root crowns. Seedlings emerge during the growing season to form rosettes. Rosettes send up a flowering stalk in the summer. Spotted knapweed has leaves divided into lobes while brown knapweed leaves are lance shaped. Treatment: Apply 12 to 16 fluid ounces of DuraCor ®
herbicide per acre or 1.5 to 2.1 pints of GrazonNext ® HL herbicide per acre during vegetative plant stage in both the spring and fall.
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